Yes, a wired xbox 360 controller can be used on a PC as a gamepad.
if you are willing to spend a little more you can get an adapter for wireless controllers, but a wired works the same.
A person can buy a wired Xbox 360 controller from many electronic and gaming retailers. Game retailer Gamestop sells wired Xbox 360 controllers. Wired Xbox 360 controllers can also be bought at Best Buy.
There is two USB slots on the front of the xbox 360 behind the flap plug the usb wired controller into there
internet a wired adapter (comes with xbox 360) or wireless adapter (I like wireless) electricity
Yes you can can buy them.
No
yes - install microsoft driver for xbox 360 and should work with all wired controllers.
You need to buy a PC Xbox 360 controller.
40$
I don't think so
ebay or Amazon